The IRS has already received a copy of both your 1099-B and your W-2. You are adding the number to your cost basis that they know should be added to the basis.
As far as how to enter the sale in TurboTax it's kind of dealer's choice. You can divide the amount on your W-2 by 10 and enter it into each transaction or enter the whole thing in the summary section. Either way it still adds up to the right total.
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